Improvement in coolers for grinding-mills



P.-C. FRITZ.

Cooler for Grinding Mills.

No. 59,382. Patented Nov. 6, 1 866.

. i A V UNITED STATESPATENT OFFICE.

P 0. FRITZ, OF BARRYTOWN, NEW YORK.

IMPROVEMENT IN COOLERS FOR GRINDING-MILLS.

Specification forming part of Letters Patent No. 59,382, dated November6, 1866.

To all whom it may concern Be it known that I, P. U. FRITZ, of Barrtown, in the county of Dutchess and State of New York, have invented anew and Improved Cooler Attachment for Mills; and I do hereby declarethat the following is a full, clear, and exact description thereof,which will enable those skilled in the art to make and use the same.

The present invention consists, principally, in. causing a circulationof fresh and cool air to be maintained in and between thegrindingsurfaces of the grindstoncs for grinding wheat, flour, &c.,whereby the same are kept from becoming heated, which oftentimesseriously affects and injures the flour being ground, and also throughthe chamber in which the conveyor is arranged for carrying the flour asfast as ground and delivered from the stones to the bolting-mill, bymeans of which all moisture is carried off, leaving the flour dry, theadvantages of which are manifest to all con- :rsant with the grinding offlour.

In accompanying plate of drawings my im- 'ovements are illustrated,Figure 1 being a longitudinal vertical section through theconveyer-chamber, and taken in the plane of the line a; .00, Fig. 2,which is a transverse vertical section thereof, and of the millstones,taken in the plane of the line 3 3 Fig. 1.

a a in the drawings represent the two grindstones, arranged asordinarily with regard to each other, and surrounded and incased by acurb, 11, having an opening, 0, in one of its sides communicating withthe chamber 0, arranged alongside of the curb,with a conveyer, d, hungtherein, consisting of a spiral screwshaped shaft, f, to which conveyermotion is communicated in anyproper manner. To the end g of theconveyer-chamber is an upright or vertical spout, a, in the upper end ofwhich i is hung a fan-blower, I, made of any of the ordinaryconstructions, which fan-blower is revolved in any suitable manner byconnecting the pulley m of its shaft n with the driving-power used. Thisfan-blower is arranged within a chamber, p, having an opening, q,communicating with the external air.

It is obvious that by revolving the fan-blower with great rapidity adraft or current of air is established down through the on: b of thestones at c and between their grinding-surfaces, and then through theconveyer-chamber, escaping therefrom at the opening of the fan-chamber;and by such draft of air the stones are necessarily kept from becomingheated to any great degree, and the moisrure contained in the flourground carried off, whereby a much better quality of flour can "beproduced and a more rapid grinding of the same obtained, as is manifestwithout further description.

What 'I claim as new, and desire to secure by Letters Patent, is-

The arrangement of the fan 1, tube h, chamher 0, and conveyer d inrelation to each other and to the stones a, as and for the purposesspecified. v

The above. specification of my invention signed by me this 28th day ofSeptember, 1865.

P. 0. FRITZ.

Witnesses M. M. LIVINGSTON, G. L. TOPLIFF.

